Preheat oven to 200°C (180°C fan) mark 6. Line a 20.5cm (8in) cake tin with one large piece of baking parchment. Peel and coarsely grate the potatoes. Pile the grated potato on to a clean tea towel, gather up the corners and squeeze out as much moisture as you can.

Empty the squeezed potato into a large bowl and mix in the flour, egg, crushed garlic, grated onion, melted butter and plenty of seasoning. Pile mixture into the lined tin and push down to level the surface. Cover with aluminium foil and cook for 30min. Remove foil and cook for a further 20min or until rosti is crispy and brown on top - the exact time needed can vary depending on the depth of the tin.

Leave the rosti to settle in the tin for 5min, then transfer to a serving plate. Serve in slices.

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